Screen goed black for half second

chip failure

Most sets use two boards (each drives the image on half the screen) some combine both into a single larger board but if a even half of the screen is doing something the other half is not that is where the problem likely is.

Different makers use different names for this like T-Con or Y out etc.

You if interested might Google the model number with "parts" which may provide you a list of the boards in this set along with prices in some cases.

These sets use for the most part two boards--each drives the screen on one side---also possible as suggested here the problem is inside the panel or where it connects to these boards--if inside the panel (the entire front screen unit) it is fatal as it cannot be got at and the display costs more than the set did new.

if it is a black block, look in the menu under closed captions and see if it is in the text mode. if so change back to cc1 or turn off.

Does it look like the bands in the picture? it is defective panel.

Try this: got to www.sony.com mouse over "support" then click on "drivers/software" enter your model #(s) and then you can check for firmware updates, the symptoms that you list, unfortunently are somewhat common when connected via HDMI cables.
Check for updates on both product that you list.
Good luck !

Contact Sony. There is a software update for this. Go to www.Sony.com for contact information.

sony bravia tv screen goes black after a minute

More then likely your power supply failed. If you do not hear a click from the relay during the power up cycle then your power supply failed.

40X2000, both PS3 and DVD player are using a HDMI input and both flicker and loose signal fully, have to turn TV of then back on to get signal back. Sony say they have never heard this problem and replaced board. NOTHING fixed, still same problem.